From WP dashboard, go to Essential Real Estate –> Real Estate Options –> Google Map
Google Map panel has all options where you will be able to setup google map extra information & settings.

Attribute	Description
Google Maps SSL	Optionally you can choose to use Google Maps with SSL
Google Maps API KEY	Insert your Google Maps API KEY. We strongly encourage you to get an APIs Console key and post the code in Theme Options. You can get it from here.
Default Map Zoom	Setup default proportion zoom in Map by enter a value (1-20) or drag scroll bar
Pin Cluster	Yes/No use pin cluster on google map.
Style for Google Map	Create styles Google Maps with you custom colors use https://snazzymaps.com/. You just need to copy and paste the code they provide into the code box.
Marker Icon	Upload Marker Icon for Google Map.